The IP Shield is a list of domain names with associated IP addresses that will be checked during the SMTP MAIL FROM command. An SMTP connection claiming to be from someone at one of the listed domains will be honored only if the IP address of the sending server matches one of the permitted IP addresses listed for that domain.
Configuration
Enable IP Shielding
Check this box to enable the IP Shielding feature.
Check FROM header address against IP Shielding database
Check this box if you want the IP Shield to compare the address taken from the message's FROM header in addition to that taken from the SMTP MAIL value. This option is disabled by default.
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Using this option could cause problems for certain types of messages, such as those coming from some mailing lists. It should therefore be enabled only if you are sure you need it. |
Currently defined domain/IP pairs
This is the list of domains and associated IP addresses that will be checked when a message is purported to be from one of those domains. The IP address of the server delivering the message must be listed for the corresponding domain.
Exclude messages to valid local users
By default when a message is addressed to a valid local user the server delivering the message will not be checked against the IP shield. Clear this checkbox if you do not wish to exclude messages from IP Shielding when they are addressed to local users.
New
To add a new domain/IP address entry to the list, click New. This will open the IP Shield Entry page.
Edit
To edit an existing entry, double-click that entry or select it from the list and click Edit. This will open that entry in the IP Shield Entry page.
Delete
To delete an entry from the list, select the entry and click Delete.
IP Shield Entry
Domain & IP Information
This is the page that will open when creating a new IP Shield entry or editing an existing one.
Save and Close
After adding or editing the domain, IP address, and any comments associated with an IP Shield entry, click Save and Close to save the entry and go back to the IP Shielding page.
Close
Click Close to go back to the IP Shielding page without saving any information or changes you may have made to the IP Shield Entry page.
Domain
Enter the domain name here that you wish to add to the IP Shield.
IP Address
Enter the IP address that will be associated with the domain listed above. When a message claims to be from this domain then the IP address of the server delivering the message must match this one.
Comment
Use this area for listing any comments associated with the entry.
Exclusions
Exclude messages to valid local users
Check this box if you wish to exclude messages from IP Shielding when they are addressed to valid local users.
Exclude messages from authenticated sessions
Check this box if you want an incoming message that is being sent from an authenticated session to be exempt from IP Shielding.
Exclude messages from domain mail servers
Messages coming from one of your domain mail servers are exempt from IP Shielding by default. Clear this checkbox if you do not wish to exclude domain mail servers from IP Shielding.
